A true orthophoto is an orthophoto with geometric corrections applied to position the buildings and other features in their exact geographic locations. Often, buildings and other objects appear to “lean” when they are not directly under the camera. The two adverse effects of this are that the roof of the building is portrayed in an erroneous location, and ground-level imagery (usually on two sides of a building) is blocked by the feature. The true orthophoto process corrects these effects by moving the pixels corresponding to the feature surfaces to their proper position and filling any voids with pixels from other images.
Tags: image manipulation